decreased appetite in 6 year old

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DD used to eat very well and is about 3lbs overweight. REcently she seems to have naturally cut down her intake. Not to the point where i am worried. I am just curious if children's appetite is normally decreased when they get older. She is her usual self apart from that

my 6 year old dd is the opposite, shes eating us out of house and home, shes always hungry! I think her weight is about normal for her height, she is taller than the average 6 year old.